Merino wool top and fabric have been treated with low-temperature plasma of water/argon under atmospheric pressure for 30 and 180 seconds, and then dyed with two leveling-type acid dyes, C. 1. Acid Orange 7 and Red 18, and two milling-type acid dyes, C. 1. Acid Blue 113 and Blue 83. Dyeing rate and saturation dye exhaustion increased with the atmospheric low-temperature plasma treatment, and half-dyeing time was reduced by plasma treatment. Also barrier effect at the beginning of dyeing of wool fibers was diminished. Fabrics treated by the atiilospheric low-temperature plasma with water/argon for 180 seconds were dyed at various temperatures in the range of 30~9$0^{circ}C$, and K/S value was similarly increased.